Microprocessor systems and bus address translation methods
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United States of America Patent
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Dec 9, 2008
Grant Date -
Oct 26, 2006
app pub date -
Apr 25, 2005
filing date -
Apr 25, 2005
priority date (Note) -
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Abstract
A microprocessor system contains a read-only memory (ROM) for storing programs or firmware. Retrieval and execution of program code is controlled by a microprocessor address bus. Erroneous data in the ROM can be corrected by address comparison and translation. Trap, region, and patch tables are provided to store addresses, regions, and translated addresses. An address issued by the microprocessor is stored in the trap and region tables can be translated for selecting another programmable device, such as a SRAM or DRAM, other than the original ROM. Thus, erroneous code in the ROM can be corrected, inserted, or replaced.
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